logic application layer 逻辑应用层
Any data source (file, web service, custom store, application logic layer, etc).
任意的数据源(文件、Web服务、定制存储、应用逻辑层等)。
Application logic layer was established in lower layer frame, function module was described with metadata file.
在低层框架上构建应用逻辑层，并用元数据文件描述模块功能。
Ideally, you should be using these functions to do string manipulations better and pushing more application logic into the SQL layer, rather than implementing the same logic in your application.
理想情况下，应该使用这些函数更好地执行字符串操作，将更多的应用程序逻辑植入sql层而不是在应用程序中实现这些逻辑。
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